Despite the praise normally heaped upon him, Leonardo da Vinci was actually an idiot and an evil jerk. He was also an alien. Hailing from the planet Vinci, Leonardo was a moron by his peoples standards, thus his departure to Earth. When he discovered it was no better to be surrounded by nothing but idiots, Leonardo returned to his home planet, but maintained a deep hatred for his people as they heaped scorn upon him for lacking the same abilities as them. He created an unstoppable doomsday device (with ice cream as a byproduct) once Fry and the Professor returned his plans from Earth. His machine was a failure after being thwarted by Fry (it barely killed anyone) and shortly after, Leonardo accidentally crushed himself to death when the revenge device backfired.